package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVO;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVO;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import javax.management.RuntimeOperationsException;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    private ProductFeignService feignService;
    @Autowired
    private WareOrderTaskService wareOrderTaskService;
    @Autowired
    private WareOrderTaskDetailService wareOrderTaskDetailService;
    @Autowired
    private OrderFeignService orderFeignService;


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId
         * wareId
         */
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId) && !"0".equalsIgnoreCase(skuId)) {
            wrapper.eq("sku_id", skuId);
        }
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId) && !"0".equalsIgnoreCase(wareId)) {
            wrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Transactional
    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1.判断还没有这个库存记录，则进行新增操作
        List<WareSkuEntity> wareSkuEntities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (wareSkuEntities == null || wareSkuEntities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字,如果失败，整个事务无需回滚
            //1.自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = feignService.info(skuId);
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0) {
                    wareSkuEntity.setSkuName((String) data.get("skuName"));
                }
            } catch (Exception e) {

            }


            //wareSkuEntity.setSkuName("");
            wareSkuDao.insert(wareSkuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }

    }

    @Override
    public List<SkuHasStockVO> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVO> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVO vo = new SkuHasStockVO();
            //查询当前sku总库存量
            Long count = this.baseMapper.getSkusHasStock(skuId);

            vo.setSkuId(skuId);
            vo.setHasStock(count == null ? false : count > 0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     *
     * @param wareSkuLockVo
     * @return 库存解锁的场景
     * 1）下订单成功，订单过期没有支付被系统自动取消/被用户手动取消
     * 2）下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚，之前锁定的库存就要自动解锁
     */
    @Transactional
    @Override
    public Boolean orderLock(WareSkuLockVo wareSkuLockVo) {
        /**
         * 保存库存工作单的详情
         * 追溯。
         */
        WareOrderTaskEntity task = new WareOrderTaskEntity();
        task.setOrderSn(wareSkuLockVo.getOrderSn());
        wareOrderTaskService.save(task);

        //1.按照下单的收货地址，找到一个就近仓库，锁定库存。
        //1.找到每个商品在哪个仓库有库存
        List<OrderItemVO> locks = wareSkuLockVo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = this.baseMapper.listWareIdHasSkuStock(skuId);
            stock.setWareIds(wareIds);
            return stock;
        }).collect(Collectors.toList());
        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareIds();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有这个商品的库存
                //订单失败
                throw new NoStockException(skuId + "");
            }
            //1.如果所有商品都锁定成功，将当前商品锁定了几件的工作单记录发送给mq
            //2.如果锁定失败，前面保存的工作单信息回滚，即使发送出去的消息要解锁记录，由于去数据库查不到库存单id，所以就不用解锁
            // 1：1-2-1    2：2-1-2   3：3-1-1(失败)
            for (Long wareId : wareIds) {
                //成功更新的记录数。成功就返回1 否则是0
                Long count = wareSkuDao.lockSku(skuId, wareId, hasStock.getNum());
                if (count == 0) {
                    //当前仓库锁失败，尝试下一个

                } else {
                    //成功
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity taskDetail = new WareOrderTaskDetailEntity(null,
                            skuId,
                            "",
                            hasStock.getNum(),
                            task.getId(),
                            wareId,
                            1
                    );
                    wareOrderTaskDetailService.save(taskDetail);
                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(task.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetail, stockDetailTo);
                    //只发id还不行，防止回滚以后找不到数据
                    stockLockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);
                    skuStocked = true;
                    break;
                }
            }
            if (skuStocked = false) {
                throw new NoStockException(skuId + "");
            }
        }
        //3.肯定所有商品锁定成功
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detail = to.getDetail();//库存工作单详情
        //解锁
        //1.查询数据库关于这个订单的锁库存信息
        //有：证明库存锁定成功了
        //      解锁：订单情况
        //          1.没有这个订单，必须解锁
        //          2.有这个订单，不是解锁库存
        //               订单状态：已取消 解锁库存
        //                          没取消，不能解锁
        //没有：库存锁定失败也回滚了 这种情况无需解锁
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detail.getId());
        if (byId != null) {
            //解锁
            Long id = to.getId();//库存工作单id
            WareOrderTaskEntity task = wareOrderTaskService.getById(id);
            String orderSn = task.getOrderSn();//根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                if (data == null || data.getStatus() == 4) {
                    //订单不存在或被取消 解锁
                    if (byId.getLockStatus() == 1) {
                        //当前库存工作单详情状态为已锁定但是未解锁，才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detail.getId());
                    }
                }
            } else {
                //远程服务失败
                throw new RuntimeException("远程服务失败...");
            }

        } else {

        }

    }

    //防止订单服务卡顿，导致订单状态改不了，库存消息优先到期，订单状态是新建状态，什么都不做就走了，导致卡顿的订单永远无法解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo to) {
        String orderSn = to.getOrderSn();
        //查一下最新的库存解锁状态，防止重复解锁库存
        WareOrderTaskEntity wareOrderTaskEntity = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long taskId = wareOrderTaskEntity.getId();
        //按照工作单找到所有没有解锁的库存 进行解锁
        List<WareOrderTaskDetailEntity> details = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", taskId).eq("lock_status", 1));
        for (WareOrderTaskDetailEntity detail : details) {
            unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detail.getId());
        }
    }

    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //库存解锁
        wareSkuDao.unlockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity();
        taskDetailEntity.setLockStatus(2);//修改库存单详情状态为已解锁
        taskDetailEntity.setId(taskDetailId);
        wareOrderTaskDetailService.updateById(taskDetailEntity);
    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareIds;

    }
}